/* CirKit: A circuit toolkit
 * Copyright (C) 2009-2015  University of Bremen
 * Copyright (C) 2015-2017  EPFL
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include "foreach_vshape.hpp"

#include <boost/assign/std/vector.hpp>

#include <core/utils/bitset_utils.hpp>
#include <reversible/circuit.hpp>
#include <reversible/functions/add_gates.hpp>

namespace cirkit
{

void foreach_vshape( unsigned n, const std::function<void(const circuit&)>& f )
{
  using namespace boost::assign;

  boost::dynamic_bitset<> range( (2u * n - 1u) * (n - 1u) );
  do
  {
    circuit circ( n );

    for ( unsigned i = 0u; i < 2u * n - 1u; ++i )
    {
      unsigned t = i < n ? i : (2u * n - 2u - i);
      unsigned offset = i * ( n - 1u );

      gate::control_container controls;
      for ( unsigned j = 0u; j < n - 1u; ++j )
      {
        unsigned c = j < t ? j : j + 1u;
        if ( range[offset + j] )
        {
          controls += make_var( c );
        }
      }
      append_toffoli( circ, controls, t );
    }

    f( circ );

    inc( range );
  } while ( !range.none() );
}

}

// Local Variables:
// c-basic-offset: 2
// eval: (c-set-offset 'substatement-open 0)
// eval: (c-set-offset 'innamespace 0)
// End:
